public class FilteringFeed extends ItemFeed
Modifier and Type | Class and Description |
---|---|
static interface |
FilteringFeed.Filter
Interface defining the filter function, to be implemented by the caller
|
static class |
FilteringFeed.OpaqueFilter
A filter that matches nothing
|
static class |
FilteringFeed.TransparentFilter
A filter that matches everything
|
Constructor and Description |
---|
FilteringFeed(Feed nextFeed,
XPathContext context,
FilteringFeed.Filter filter)
Create a filtering feed
|
Modifier and Type | Method and Description |
---|---|
void |
close()
Finish evaluating the expression.
|
void |
endSelectedParentNode(Location locationId)
Signal that the endElement event has occurred for the element whose startElement
event caused the Watch to be activated.
|
SequenceReceiver |
getReceiver()
Get a receiver to which start and end events for documents and elements can be
written.
|
void |
open(Terminator terminator)
Start evaluating the expression.
|
void |
processItem(Item item)
Supply one item towards the streamed input of the expression
|
Receiver |
startSelectedParentNode(FleetingParentNode node,
Location locationId)
Signal that an element or document node has been found that matches the selection that this
Watch is looking for.
|
dynamicError, getContext, getExpression, getPipelineConfiguration, getResult, getTerminator, hasFailed, processItems, setExpression, setHasFailed, setPipelineConfiguration, setTerminator
public FilteringFeed(Feed nextFeed, XPathContext context, FilteringFeed.Filter filter)
nextFeed
- the feed to which the filtered items/events will be sentfilter
- a function which tests whether the item/node/event at a particular
position is to be selectedpublic void open(Terminator terminator) throws XPathException
ItemFeed
open
in interface Feed
open
in class ItemFeed
terminator
- used to achieve early exitXPathException
- if a dynamic error occurspublic Receiver startSelectedParentNode(FleetingParentNode node, Location locationId) throws XPathException
ItemFeed
startSelectedParentNode
in interface Feed
startSelectedParentNode
in class ItemFeed
node
- the element or document node whose start event has been matchedlocationId
- the location associated with the element or document node (may be
the location of the instruction that created it)XPathException
- May be raised if a dynamic error occurspublic void endSelectedParentNode(Location locationId) throws XPathException
ItemFeed
endSelectedParentNode
in interface Feed
endSelectedParentNode
in class ItemFeed
locationId
- the location of the elementXPathException
- May be raised if a constraint implemented by this
Watch is violatedpublic void processItem(Item item) throws XPathException
ItemFeed
processItem
in interface Feed
processItem
in class ItemFeed
item
- the item to be suppliedXPathException
- May be raised if a dynamic error occurspublic void close() throws XPathException
ItemFeed
close
in interface Feed
close
in class ItemFeed
XPathException
- if a dynamic error occurspublic SequenceReceiver getReceiver()
getReceiver
in interface Feed
getReceiver
in class ItemFeed
Copyright (c) 2004-2018 Saxonica Limited. All rights reserved.